Molding-machine.



B. KELLER.

MOLDING MACHINE. APPLTOATION FILED MAY 5, 1913.

Patented Mar.2,1915.

2 SHEETS-SHEBT 1.

VIIIIIIIIIIWIIIIJ THE NORRIS PETERS Co. PHOTO-LITHO.. WASHINGION, D c.

B. KELLER.

MOLDING MACHINE.

APPLICATION FILED MAY 5, 1913.

Patented Mar. 2, 1915.

2 SHEETS-SHEET 8.

THE NORRIS PETERS C01. F'HOTO LITHO WASHINGTON, D. c.

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BERNHARD KELLER, OF DUISBURG-MEIDERICH, GERMANY, ASSIGNOR TO MASCI-IINEN- FABRIK THYSSEN & .CO., AKTIENGESELLSCHAFT, OF M'ULHEIM- ON- THE- BUT-IR,

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Specification of Letters Patent.

MOLDING-MACHINE.

Patented Mae. a, was.

Application filed May 5, 1913. Serial No. 765,527.

To all whom it may concern Be it known that I, BERNHARD KELLER, a subject of the Emperor of Germany, and a resident of Duisburg-Meiderich, Germany, have invented certain new and useful Improvements in Molding-Machines, of which the following is a specification.

This invention relates to machines for use in producing molds in condition to receive the molten metal in foundry work and the like and it comprises means for jarring the forms for the purpose of packing the sand in the mold.

There are machines of the kind described already known in which the packing of the sand is effected by blows applied by a hammer to the under side of the mold support or a part rigidly connected therewith. In these machines the working movement is produced by compressed air which is introduced immediately underneath the hammer and is allowed to escape after each stroke. The air, however, introduced," underneath the hammer cannot at first act with full power and a relatively large stroke of the hammer is therefore necessary-in order to produce a sufficient acceleration of the movement of the hammer to obtain a sufiicient jarring of the mold support;

The invention now consists inallowing the compressed air to act on the hammer with full power from the beginning. As

the hammer therefore has to make only a I fraction of the movement that is necessary in the known machines of this kind, the new construction of the machine guarantees great saving in power consumption.

The object of the invention may be attained by retaining the hammer in its lowest position until the compressed air or similar power introduced thereunder has reached its full pressure, whereupon the retaining catch is released and the hammer suddenly exposed to theinfiuence of the compressed air. Whether tension or compression springs are used, they are fastened at one end to the hammer, which is at first being held down, while the opposite end of each spring is moved upward. ,On being subse quently released, the hammer rushes quickly upward, actuated by the springs.

Another manner of attaining the object 1 of the invention consists in first moving the hammer downward in any desirable way, thereby causing the compression of an a1r or which is increased during the downward a movement of the hammer, may also be renewed by the supply of additional compressed air during the upward movement of the hammer or be kept at an equal pressure. The subject matter of the invention is illustrated in the drawings in several different embodiments and :Figure 1 shows a vertical section of a molding machine; Fig. 1 a partial section similar to Fig. 1 slightly modified; Fig. 2, a view similar to Fig. 1 of of a second modification; Fig. 3, a third embodiment of the invention also in vertical section but in larger scale and; Fig. 4, a fourth embodiment in a view similar to Fig. 3.

In Fig. 1 a guiding piston b is rigidly connected with the mold support a. A hanr mer 0 slides upon said piston b which hammer is guided in its turn by the stationary casing d. The mold support a can either be firmly supported or rest on an air cushion 79, see Fig. 1 or as illustrated in Figs. 2 to l, it may be supported by rods and springs. Several pistons 51 connected to the hammer by means of piston rods 3, Fig. 1, are used for the drawing down of the hammer c which pistons move in cylinders r and are actuated by compressed air or like means.

The spring cushion which actuates the upward throw of the hammer '0 consists here of springs g which may also be assisted by an air cushion tsituated under the hammer 0. A similar air cushion may also be provided'under the piston g. The inlet and outlet of the compressed air, here assumed as motive power, is regulated by means of a valve gear 70.

The operation of the machine proceeds as follows :-The compressed air, entering the cylinders r by means of the valve gear 70, moves the pistons g downward and subsequently the hammer c by means of the rods 3, whereby thesprings g with or without the air cushion t are compressed. The mold support a is immovably held in its suspended position during this time either suphammer has moved a certain distance 7 boxes, which havebeen placed on the mold support whereby the packing of the sand in the boxes is attained. ,After the knocking of the hammer c against the butter .orbuffers 0 fixed to the mold support a, the inlet in tl ecylindjers 1" above the piston g is again opened so that the whole process may be repeated. f v f In Fig. 2 the mold support, when, at rest, is kept in position by means of a number of rods u'togeth'er with springs e and f; the

springs permittingof an adjustment of the V position of the mold support. The supply Qf'fill isagain regulated by means of a valve gear 70., The compressed a1r enters here bej tween the guide piston b and the hammer 0 through the canal As the piston is drawn down by means of the springs f, the hammer goes downward under the action of the n Fig. 3, thecanal h, for the entrance of the air, is arrange'd between the hammer c and 'a piston 2' which is rigidly connected with ,the stationary casing (Z and which is also guided in the hammer cylinder sur- 1 rounding the guide piston Z) so that the hammer is again pressed downward. It is however not necessary. that the parts er the hollowcylinder which guide the c' possess the same diameters.

In Fig. 4 the hammer c is formed on the outside into a stepped piston. The air works on the step ring a underneath the bushing m inserted in the casing 03 and, as the casing is a fixture the hammer must move downward. a a I a The machine may also be constructed as pistons b and a lifting carrier, turn-plate, or stripping machine.

1. In a jarring molding machine, a mold table, a reciprocating hammer, and a housing therefor, said hammer constructed to beat against said molding table from below, 'means providing a resilient support for said hammer, means by which said resilient support iscaused to act with full force upon said hammer at the beginning of each stroke.

2. In a jarring molding machine, a mold a table, a reciprocating hammer and a-housi'ngthe'refor, said hammer constructed to beat against said mold table from below,

means providing a resilient support for said hammer, means for retaining the hammer in its lowermostposition until said resilient support has accumulated its greatest power. 3. In a jarring molding machine, a mold table, a reciprocating hammer and a housing therefor, said hammer constructed to beat ag ainst said mold table from below, means providing a resilient support for said hammer, means for moving the hammer downward thereby accumulating power in the resilient support for subsequently acting upon the hammer. l v 4 I" a jarring molding machine, a mold table, a reciprocating hammer and, a housingthereforysaid hammer constructed to beat against. saidniold table from below,a resilient supportadapted to liold the mold table in a predetermined normal position, and means by which said resilient support is caused want with full force upon said hammer at tlie beginni'ng of each stroke.

5. In a jarring molding machine, a mold table, a reciprocating hammer and a housing therefor, saidliaminer constructed to beat against said mold table from below, a resilient supportpadapted to hold the mold table in a predeterminednormal position, and means by which said'resilient support is caused to act with full force upon said hammer the beginning ofea'ch stroke; and means for adjusting the predetermined normal position; I

I g 6,111 jarring machine, a mold'table, a reciprocating hammer and a housing therefor, said hammer constructed t'oybeat against said mold table hem below, means provida resilient sup err for. said hannner, 'external members for moving V saidhammer downward therebyaec'uinulating power in the resilient'sup'port for subsequently acting uponthe hammer.

. an a jarring'm'olding njmhihe, a'niold table, areeiprocating hammer and a housing therefor, said hammer constructed to beat against said mold table from below, means providing a resilient support for said hammer, meansror moving the hammer 'downward 'therebya'ccumulating power in the resilient support for subsequently acting iip onfthe hammer, a' chamber irisaid hammer, a piston working ins'aid chamber, said piston being" rigidly connected with said mold table, means for introducing a pressure medium into said chamber to act between said piston and said hammer, means for ret'ain'ing" "said: mold table ina substantially stationary position relative to said housing, whereby said hammer will be forced downward on the admittance of said pressure me- 8. In a jarring molding machine, a mold table, a reciprocating hammer and a housing therefor, said hammer constructed to beat against said mold table from below,'means providing a resilient support for said hammeasaa -means for introducing a pressure medium into said chamber to act between said piston and said hammer; means for retaining said mold table in a substantially stationary position relative to said housing, whereby said hammer may be forced downward on the admittance of the pressure medium.

9. In a arring molding machine, a mold table, a reciprocating hammer and a housing therefor, said hammer constructed to beat against said mold table from below, means providing a resilient support for said hammer, means for moving the hammer downward thereby accumulating power in the resilient support for subsequently acting upon the hammer, a chamber formed between said hammer and said housing, means for introducing a pressure medium into said chamber to act between said housing and said hammer, means for retaining said mold table in a substantially stationary position relative to said housing, wherebysaid hammer will be forced downward on the admittance of said pressure medium.

7, 10. In a jarring molding machine, a mold Copies of this patent may be obtained for table, a reciprocating hammer and a housing therefor, said hammer constructed to beat against said mold table from below, means providing a resilient support for said hammer, means for moving the hammer downward thereby accumulating power in the resilient support for subsequently acting upon the hammer, means for retaining the mold table in its normal position, said means comprising resilient members permitting a slight movement in opposite directions out of said normal position.

11. In a jarring molding machine, a mold table, a hammer coaxial with said mold table and forming a guide therefor, a housing inclosing said hammer and permitting reciprocating movement of the hammer relative to the housing, resilient means acting on said hammer and tendin to press the hammer against said mold ta le, a pressure chamber in connection with said hammer, and means for admitting pressure medium into said chamber, thereby moving said hammer against the power of said resilient means.

The foregoing specification signed this 14th day of April, 1913.

BERNHARD KELLER.

In presence of CARL GUBLER, AUsUs'r RUIGG.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

